The position \( (x) \)-time \( (t) \) graph for a particle moving a...

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The position \( (x) \)-time \( (t) \) graph for a particle moving along a straight line is shown in figure. The average
\( P \) speed of particle in time interval \( t=0 \) to \( t=8 \mathrm{~s} \) is
(1) Zero
(2) \( 5 \mathrm{~m} / \mathrm{s} \)
(3) \( 7.5 \mathrm{~m} / \mathrm{s} \)
(4) \( 9.7 \mathrm{~m} / \mathrm{s} \)
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